it might be mapping issues as @trex5365 suggests in this topic. Engine 1 does not start A320 - #2 by TripsyTipsy
Or maybe framewire issue,as the latest post suggests.
For the larger planes like airbus & boeing the key combo sometimes work partially
Ive had issues on the Boeing too starting engine using key combo.as described in the link.A helpful guide can be found there now how to start the Airbus & Boeing manually too.
Since this patch there have been other unresponsive buttons like the b to fix altitude etc & the key combo to balance fuel tank ,crtl+alt & F1 or f2,if i remeber correctly
So the mapping issues might not be limited to starting planes.
Its awesome saucy to be able to fly DaherTBM930 again,thx very much